Filtering apparatus



Dec; 2, 1930. E. w. w. KEENE FILTERING APPARATUS Filed March 1, 1930 4 Sheets-Sheet l Dec. 2, 1930.

E. W; KEENE FILTERING APPARATUS Filed March 1, 1930 4 Sheets-Sheet 2 ATTORNEYS.

Dec. 2, 1930. E. w. w. KEENE 1,783,937

FILTERING APPARATUS Filed March 1. 1930 4 Sheets-Sheet 3 I I I I- I I I I I l I I I I I I l wvavroxa m n I n n n a "l \nm F "M, v HTTORNEYZ Dec. 2, 1930. E. w. w. KEENE FILTERING APPARATUS 4 Sheets-Sheet 4 Filed March 1, 1930 (D/ A mom I.

" a rotary member such as a drum.

Patented Dec.d2, 1930' E L K 'e trmuusr a i v Application iilled' lgarch IL93OQSerialNo. 432,424,15m1 ri Great Britain fi'o vemlier 8 i The present invention relates to filtering appara tus and more particularly to rotary. filters m which a; filtering medium; such as,

for example, a filtering'cloth, is carried upon Inretary filters of the type set forth it is wellknown to provide anuinber'offilter conipartments which are subjected to a vacuum-or a pressure or again aresuhjected intermittent- 10 ly" to both vacuum and pressure duringthe filtering process; .:I n;;merring herein {to 7 known; constructions or to; the present invention, forthe sake of-cleariiess, mentionwill only be. made to vacuum, butit willfl'be 'appre- J ciatedthat-wheref vacuum is referred to, the construction is equally well.- applicable to" the use 01 pressure or again tol'the intermittent useof vacuum and'pressurei" The two most well knownforins of construction at presentusedeither involve the use of aiseri'es of pipes as the means for'subjecting' the multiple; filter compartments to a vacuum; or alternatively the menibers supporting the filtering-medium,- such as a filter 5 cloth, are constructed-of cellular shape form;

ingfseparajte compartments: y

In the case of the "former type;and'partic'u lar ly' where a comparativelylargenumber of pipes are required for the purpose of promoting maximum; efiic'iency,- a 'co'n'gestion' is caused; Whilst other "disadvantages exist in that an uneven directional distribution of vacuum is created, a great number ofjjo-ints haveto be made for the pipe ends, audiences sive labour is involved in setting'u'p the P nt. and henev r r pla me P p required. v a r a y In the latter case it is usual, in order to completely isolate the cellularshap'ed memeach other, to make these by. casting the Whole en bloc i. eintegral with the drum end plates as otherwise difliculty is experienced in making the compartments airtight. This involves the disadvantages that an excessive amount of material has to be used with the consequential result that the plant is heavy, Whilst a surplus duty is imposed upon the accessory plant required for providing the desired vacuum owing'to the large and uncorcl ing to Figure i--2 Figure: 3' is" an i enlarged bers forming the filtercompartments from. sprea'dthezsuctionaf' L15 q Forxthis purpo'se the iormed :of chan'neL members arranged "in pairs, each pair of channel members; forming twolseparate mains one; to. each compartment,

for eitheridisplacement orrep'la cement. (The I object of thefpresent inventionis to overcome the disadvantages referred to that 1s to say to provide a rotary "filterffree from both the difiiculties "andi disadvantages of the two most well knowntypes. 1 I: i

- 'llhe invention I isamore part'icularly' describe d with :refe'rence to the accompanying drawings' in which Figure I: is a sectional viewthrough one half eta drum shaped rotary filter constructed} agcerem mthe present inventional "jjFigure is a partialaendielevation ingsection 015 the right hand; end of the drum ac} sectiona VIEW i necessary drainage area or it volume lexposed v 'lo r l gitu dina-lly? through the: :drum'. shewing e.

the Iconstruction of a; shallow filter comp artrnent f 1 l p j j :Figure 4 is i a correspondingienlarged lan r i V r Figure 5. is F a detailr. shewing: the i nletslito J- divisional strips 1 forming the bounding walls "ofthe compartmntia it Figure 6 is a perspective View shewingiithe outlets lf'romthe: divisional: strips to thecornpartments: A I a z, a 1

In the construction acbordingzto the present inventionthe: members carrying the filter -ingmedium are shallow, whilst the multiple filters compartments are constructed by: sub- "dividing the drum-by means of'longitudinally disposed clivis'ionali strips to which means" are providedfor attachingthe filter clothe in order to make an efl'ective depaitmental sealfor each: "of the multiple filter compartments. 'llhe:divisionalrstrips also Ias'; suction inlets adirection: sideways 1' thereof fto. evenly divisional strips are These timains communicate :wl'iths conduits is securediforexalnple loy bolts; n

By such an arrangement,iai fminin um amount of labour is involved in assembling the filter, as the suction inlet conduits are self contained and constructed as a casting all in one piece and usually all in one only of the drum end plates, depending upon the practical requirements which may have to be fulfilled. V I v 0 A trunnion shaft, having-communicating cells therein leading to an automatic vacuum and pressure distributing valve, is connected to the central cellular facing ofthe drum end late.

p The divisional strips are of inverted channel section held rigidly on to the shell of the =conduits'11 converging to acentral cellular facing 12 and diverging to a machined ring facing 13 which supports thedrum formmg members 14 fixed thereto by bolts or screws 15. The'members 14, which alsoserve to carry the filteringmedium in the form of a filter cloth 16, have openings 17 leading into the conduits 11. r The divisional strips-are formed of shallow bars 18 of inverted channel section and fitted in pairs, such bars 18 subdividing the drum construction and forming the bounding walls of the multiple shallow filter compartments These bars 18 function as suction inlets and in a direction sideways, as is necessary to evenly distribute the vacuum, by means of openings 19 in the form of narrow slots in their outer webs and on the lower edge thereof at that part where they contact with the members 14. The contact surface of the inner "each' ofthe multiple filter compartments, the filter cloth 16 is held down in position on the channel bars 18, forming the divisional strips,

The channel bars 18 forming the shallow passages for the required suction inlets have their ends sealed by flanges 23 as provided by the drum end plates.

I declare that what I claim is 1. A filter apparatus comprising a drum shell having passages therethrough, radial endsfor supporting saiddrum shell, at least one of which ends has a plurality of radial conduits formed therein, a filter cloth covering for said drum shell and a plurality of inverted channel shaped members arranged in pairs between said covering and said shell for dividingthe space between saidcovering and said shell into separate filter compartments, the hollow passages formed by said inverted channel members communicating with said filter compartments and also with the radially disposed conduits insaid drum end.

2. A filter apparatus comprising a spaced pair of drum ends, at least one of which has radial conduits formed therein, a cylindrical shell on said drum having passages therethrough communicating with said radial conduits, longitudinally disposed inverted'channel members arranged in pairs and supported externally on said shell and slotted at a number of points along their length at their lower edges and a-filter cloth supported on said hollow channel members to form with said channel'members and said shell a plurality of separate filter compartments.

3. A filter apparatus comprising a drum shell having passages therethrough, hollow radial supports for said drum shell, a filter covering for said drum shell, inverted channel members arranged in pairs between said covering and said shell for dividing the space between said covering, and said shellinto' separate filter compartments, the passages of said inverted channel members communicating with those of said drum shell and with the radial conduits formed in said hollow radial supports, and sealing means for holding down said filter cloth covering on said inverted channel members to effectively render each filter compartment independent of adjacent compartments.

In witness whereof, I have hereunto signed by means of alength 21 of resilient material which is mounted in position between the inner Webs 22 of the channel bars 18 of each pair. For this purpose the inner webs 22 of the channel bars 18 are inclined inwardly or towards the outer webs so that a cavity of triangular section is formed between the bars 18 of each pair. In this way the filter cloth 16 is clinched and securely held down in its requiredposition. 

